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Weil-McLain

Weil-McLain is a North American brand of hydronic comfort heating systems, including residential and commercial boilers, heat pump systems and indirect-fired water heaters, established in 1881.

Last updated September 15, 2026

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Overview

Weil-McLain is a leading North American brand of hydronic comfort heating systems for residential, commercial and institutional buildings, established in 1881. Its product lineup includes residential boilers, commercial boilers, heat pump systems and indirect-fired water heaters, with heat exchanger technologies using cast iron, stainless steel and aluminum. The brand states it is the largest brand of boilers in North America and the largest U.S. manufacturer of cast-iron boilers under the Weil-McLain brand. It is backed by SPX Technologies and operates alongside sister companies in the HVAC segment and heating platform.

History

Weil-McLain was founded in 1881 in Chicago by Isadora and Benjamin Weil, originally as Weil Brothers. In 1918, the Weil brothers acquired a main supplier, J.H. McLain Company, and the Weil-McLain brand was born. The company has manufactured in Michigan City, Indiana for over 100 years and grew to be the largest U.S. manufacturer of cast-iron boilers under the Weil-McLain brand, with an additional manufacturing location in Eden, North Carolina. The brand has been a trusted leader in hydronic heating systems for over a century and has undertaken a brand refresh, backed by SPX Technologies and supported by business synergies with sister companies in the HVAC segment and heating platform.

Products and positioning

A leading North American brand of hydronic comfort heating systems, positioned around reliability, energy efficiency and long-standing expertise since 1881.

  • ECO Tec Premium Residential Gas Boiler

    Weil-McLain's premium high-efficiency residential boiler available in heat-only and combi models, offering up to 95% AFUE, connected capabilities through the ProTools app, flexible venting and a Unity control color touch screen.

  • SlimFit Commercial Condensing Gas Boiler

    Commercial condensing gas boiler with aluminum heat exchanger, heating range 550–2,000 MBH, water medium.

  • SVF Stainless Vertical Firetube

    Gas boiler with stainless steel heat exchanger, heating range 500–600 MBH, water medium.

  • Ultra Gas Boiler Series 4

    Gas boiler with aluminum heat exchanger, heating range 80–399 MBH, water medium.

  • AquaBalance Series 2

    Combi/gas boiler with stainless steel heat exchanger, heating range 80–155 MBH, water medium.

Recent events

  • Weil-McLain partnered with 4950 Sales in Alaska[5]

    Reported:

    Weil-McLain partnered with 4950 Sales to represent Weil-McLain's residential and commercial boiler line in Alaska.

Sources5 sources

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